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A civil patrol unit of 15 members includes 4 officers. In how many ways can 3 members be selected for a search and rescue mission such that at least 1 officer is included?

A civil patrol unit of 15 members includes 4 officers. In how many ways can 3 members-example-1
User Matteo NNZ
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1 Answer

3 votes

Explanation:

There are 4 ways to select an officer

multiply this by the number of ways to select 2 others from the 15

4 * 15 C 2 = 4 * 15!/(2!13!) = 420 ways to select

User David W Grigsby
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7.7k points
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